21323002331 has 2 divisors, whose sum is σ = 21323002332. Its totient is φ = 21323002330.

The previous prime is 21323002319. The next prime is 21323002333. The reversal of 21323002331 is 13320032312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21323002331 - 2²⁶ = 21255893467 is a prime.

It is a super-2 number, since 2×21323002331² (a number of 21 digits) contains 22 as substring.

Together with 21323002333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21323002333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661501165 + 10661501166.

It is an arithmetic number, because the mean of its divisors is an integer number (10661501166).

Almost surely, 2^21323002331 is an apocalyptic number.

21323002331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323002331 is an equidigital number, since it uses as much as digits as its factorization.

21323002331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21323002331 its reverse (13320032312), we get a palindrome (34643034643).

The spelling of 21323002331 in words is "twenty-one billion, three hundred twenty-three million, two thousand, three hundred thirty-one".